JP6518780B2 - Stabilizer for vehicle, processing device for eyeball of stabilizer, and processing method for eyeball - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stabilizer for a vehicle disposed in a suspension mechanism of a vehicle such as an automobile, an apparatus for processing an eyeball of the stabilizer, and a method for processing an eyeball.

  The stabilizer disposed in the suspension mechanism of the vehicle is a steel pipe or a solid rod-like steel material, and a pair of a torsion portion (torsion portion) extending in the width direction of the vehicle and a pair of bending portions at both ends of the torsion portion. It has an arm part (arm part). An eyeball is formed at the tip of each arm. In one example of the suspension mechanism portion, the torsion portion of the stabilizer is supported by the vehicle body via a support portion having a rubber bush. The eyeball is connected to a suspension arm or the like through a connecting member such as a stabilizer link. The stabilizer assembled to the suspension mechanism can increase the roll rigidity of the vehicle by the arm, the bend and the torsion acting as springs with respect to the rolling behavior of the vehicle body.

  For example, the stabilizer described in Patent Document 1 and Patent Document 2 has a pair of eyeballs formed by crushing both ends of a steel pipe by upset processing. Flat fastening surfaces are formed on the eyeballs, respectively. A through hole is formed in each fastening surface. A connecting member such as a stabilizer link is inserted into the through hole. The eyeball portion is connected to a suspension mechanism member such as a suspension arm via the connection member.

JP-A-7-237428 JP 2002-331326 A

  When forming the eyeball portion of the stabilizer by plastic processing such as upset processing, there is a limit in accurately regulating the shape of the eyeball portion only by plastic processing. For example, it is difficult to accurately regulate the positional relationship between the tip end surface of the eyeball and the through hole, and the flatness and parallelism of the fastening surface only by plastic working. In addition, it is also inevitable that shear creep occurs on the tip end face of the eyeball and the edge of the through hole. For this reason, in order to improve the accuracy of the eyeball portion, finish processing such as machining is required, which is time-consuming and causes cost increase.

  A connecting member such as a stabilizer link is fixed to a fastening surface of the eyeball by a screw member such as a nut. For example, in order to make the surface pressure applied to the fastening surface uniform, it is required to precisely manage the flatness and the parallelism of the fastening surface. It has been difficult to obtain a highly accurate fastening surface due to the processing limit at the time of molding and the like for the eye of the conventional stabilizer. Depending on the specification of the suspension mechanism, a stabilizer having a short distance from the tip of the eyeball to the through hole (small length of the eyeball) may be desired. In such an eyeball, for example, it is difficult to accurately manage the distance from the tip of the eyeball to the through hole and the flatness and parallelism of the fastening surface, and a predetermined fastening surface may not be obtained.

  Therefore, an object of the present invention is to provide a stabilizer for a vehicle provided with an eyeball portion having a highly accurate tightening surface, an apparatus for processing the eyeball portion, and a method for processing the eyeball portion.

One embodiment is a stabilizer for a vehicle made of a rod-like steel material (steel pipe or solid steel rod), and a torsion part extending in the width direction of the vehicle and a series of bends from both ends of the torsion part It has a pair of arm parts and a pair of eyeballs. The eyeballs are respectively provided with a first plane and a second plane parallel to each other, a trim portion located at the tip of each eyeball and having a tip surface perpendicular to the first plane and the second plane, and A through hole having an inner surface perpendicular to the first plane and the second plane and opened to the first plane and the second plane, and formed around the opening of the through hole at a part of the first plane It comprises a flat annular reference surface, a tip side curve and a hole side curve. The distal end side curved portion is formed outside the annular reference surface at a first corner where the first flat surface intersects the distal end surface, and a first length extends from the first flat surface toward the distal end surface. The thickness decreases over the The hole-side curved portion is formed on the entire circumference of the opening at a second corner where the first flat surface and the inner surface of the through hole intersect inside the annular reference surface, and from the first flat surface to the inner surface The thickness decreases towards a length that is less than the first length and is curved with a greater curvature than the distal curvature. The hole-side curved portion may have a second length of the trim-bent curved surface formed closer to the trim portion, and a third length of the anti-trim curved surface formed farther from the trim portion. And a face, wherein the third length is less than the second length.

In this embodiment, the distance from the outer circumference of the annular reference surface to the distal end surface, but it may also be smaller than the distance from the outer circumference of the annular reference surface to said opening. In this embodiment of al, the curvature of the counter-trimmed near the curved surface may be greater than the curvature of the trim near curved surface.

  According to the present invention, an annular reference surface in which the tip side curved portion formed when cutting the trim portion and the hole side curved portion formed when punching the through hole are present around the through hole of the eyeball portion ( It is possible to provide a vehicle stabilizer having a highly accurate fastening surface that can be suppressed from affecting the fastening surface).

FIG. 1 is a perspective view showing a part of a vehicle and a stabilizer. FIG. 2 is a plan view of the stabilizer according to the first embodiment. FIG. 3 is a plan view in which the annular reference surface is hatched in the eyeball portion of the stabilizer shown in FIG. FIG. 4 is a cross-sectional view of the eyeball portion taken along the line F4-F4 in FIG. FIG. 5 is a plan view in which the annular reference surface is hatched in the eyeball portion of the stabilizer according to the second embodiment. FIG. 6 is a cross-sectional view showing a state in which the eyeball portion is placed on the lower mold in a part of the eyeball processing device. FIG. 7 is a cross-sectional view of a state in which the hydraulic drive stripper is lowered in the processing apparatus. FIG. 8 is a cross-sectional view of the processing apparatus in which the upper die and the punch are lowered. FIG. 9 is a cross-sectional view of the processing apparatus in which the upper die is lifted. FIG. 10 is a cross-sectional view of a state in which the punch is raised by the same processing apparatus.

The stabilizer for vehicles provided with the eyeball part which concerns on 1st Embodiment below is demonstrated with reference to FIGS. 1-4.
FIG. 1 shows a part of a vehicle 11 provided with a vehicle stabilizer (hereinafter simply referred to as a stabilizer) 10. Stabilizer 10 forms a part of a suspension mechanism disposed under the vehicle body 12 of vehicle 11. FIG. 2 is a plan view showing an example of the stabilizer 10.

  The stabilizer 10 is made of a rod-like steel material (for example, a steel pipe), and includes a stabilizer main body 20 and a pair of eyeballs 21 and 22 integrally formed on both ends of the stabilizer main body 20. In the stabilizer 10, the eyeballs 21 and 22 are formed by crushing the end of a steel pipe flat by plastic working such as forging. For this reason, the stabilizer 10 has a hollow stabilizer main body portion 20 in which the shape of the steel pipe remains substantially as it is, and solid eyeballs 21 and 22 formed on both ends of the stabilizer main body portion 20.

  Stabilizer body 20 includes a torsion portion 25 extending in the width direction of vehicle body 12 (the direction indicated by arrow W1 in FIG. 1), and a pair of arm portions 28 and 29. The arm portions 28 and 29 are continuous with bending portions 26 and 27 from both ends of the torsion portion 25, respectively.

  Stabilizer 10 is not limited to a planar shape. For example, the torsion portion 25 may have one or more bending portions, or the arm portions 28 and 29 may have one or more bending portions, including a three-dimensional bending shape. Further, various bending shapes are formed according to the type of the vehicle 11 such that the bending portions 26 and 27 may have a three-dimensional bending shape. The surface of the stabilizer 10 is coated with a steel for rust prevention.

  The stabilizer 10 is symmetrical about the symmetry axis X1 (shown in FIG. 2) and has eyeballs 21 and 22 at both ends. The eyeballs 21 and 22 are connected to a suspension arm or the like of the suspension mechanism via a rod-like connecting member 31 or 32 such as a stabilizer link.

  The torsion portion 25 is supported by, for example, a part (for example, a cross member or the like) of the vehicle body 12 via a pair of support portions 33 and 34 including a rubber bush or the like. When forces of opposite phases are input to the arm portions 28 and 29 when the vehicle 11 travels a curve, bending forces are applied to the arm portions 28 and 29, and bending and twisting forces are applied to the bending portions 26 and 27. It takes As a result, the torsion portion 25 is twisted and a repulsive load is generated, whereby the rolling behavior of the vehicle body 12 is suppressed.

  The material of the stabilizer 10 of the present embodiment is a steel pipe, and the stabilizer main body 20 is formed into a predetermined shape by a bending machine or the like. An example of a steel material is a steel type which can improve strength by heat treatment such as quenching, for example, a steel pipe made of material ASB25N or the like. The eyeballs 21 and 22 are formed by crushing both ends of the steel material by plastic working such as forging. In the case of a solid stabilizer, a solid steel rod is used as the material.

  The eyeballs 21 and 22 are symmetrical with respect to the axis of symmetry X1 (shown in FIG. 2), and hence the eyeballs 21 (shown in FIGS. 3 and 4) will be described as a representative. The other eyeball portion 22 is configured substantially the same as the one eyeball portion 21.

  FIG. 3 is a plan view of the eyeball portion 21, and FIG. 4 is a cross-sectional view of the eyeball portion 21. As shown in FIG. 4, the eyeball portion 21 has a first plane 41 and a second plane 42 which are parallel to each other and formed by plastic working such as forging. The second plane 42 is located on the opposite side of the first plane 41. Further, the eyeball portion 21 has a circular through hole 45. The through hole 45 can be formed by a processing device 100 (shown in FIGS. 6 to 10) described later. The inner surface (inner peripheral surface) 46 of the through hole 45 is perpendicular to the first plane 41 and the second plane 42.

  The through hole 45 penetrates the eyeball portion 21 in the thickness direction, and opens in both the first plane 41 and the second plane 42. The base of a connecting member 31 (shown in FIGS. 1 and 2) such as a stabilizer link is inserted into the through hole 45. The connection member 31 is fixed to the eyeball portion 21 by a fixing screw member 31 a such as a nut. The other eyeball portion 22 is similarly configured, and the connection member 32 is fixed to the eyeball portion 22 by the fixing screw member 32a.

  In the stabilizer 10 of the present embodiment, the eyeballs 21 are formed by crushing the end of the steel pipe. For this reason, a tapered portion 47 is formed between the hollow arm 28 and the solid eye 21. The tapered portion 47 has a shape in which the thickness gradually decreases from the arm portion 28 toward the eyeball portion 21, and has a hollow portion 47a inside.

  The eyeball portion 21 includes a trim portion 51 formed at the tip of the eyeball portion 21, a circular flat annular reference surface 52 (indicated by hatching in FIG. 3), a distal end side curved portion 55, and a hole side curved portion 60. And contains. The trim portion 51 has a tip surface 50 cut by the processing device 100 (shown in FIGS. 6 to 10). The annular reference surface 52 is a part of the first flat surface 41 and is formed concentrically with the opening 45 a around the through hole 45. The distal end side curved portion 55 is formed at the edge of the trim portion 51. The hole-side curved portion 60 is formed at the edge of the opening 45a.

  The trim portion 51 is formed at the tip of the eyeball portion 21. The distal end side curved portion 55 is formed between the trim portion 51 and the annular reference surface 52. As shown in FIG. 4, in the cross section in the thickness direction of the eyeball portion 21, the tip end surface 50 of the eyeball portion 21 is perpendicular to the first plane 41 and the second plane 42. The thickness T1 of the eyeball portion 21 is, for example, 7 to 12 mm, but the value is different depending on the vehicle type.

The flat annular reference surface 52 functions as a fastening surface to which the fixing connection member 31 such as a stabilizer link is fixed. The annular reference surface 52 has an annular shape centered on the center C ₀ (shown in FIG. 4) of the through hole 45. The outer diameter R1 of the annular reference surface 52 is larger than the inner diameter R2 of the through hole 45. The annular reference surface 52 includes a trim offset flat portion 52 a located closer to the trim portion 51 and an anti-trim offset flat portion 52 b located farther from the trim portion 51.

  The eyeball 21 is formed by crushing the end of the steel pipe by forging or the like. For this reason, a pressure contact portion 61 (shown by a two-dot chain line in FIG. 4) on the inner surface of the steel pipe is present substantially at the center of the eyeball 21 in the thickness direction. The tapered portion 47 is formed between the arm portion 28 and the eyeball portion 21 by crushing the end portion of the steel pipe. The accuracy of the tapered portion 47 has a processing limit, and some variation in the shape can not be avoided. Therefore, when the annular reference surface 52 is formed in the vicinity of the tapered portion 47, the flatness of the anti-trim flat portion 52b may be affected within the range of tolerance.

  As shown in FIG. 3, the distance L1 from the outer periphery Q1 of the annular reference surface 52 to the tip end surface 50 is smaller than the distance L2 from the outer periphery Q1 of the annular reference surface 52 to the opening 45a. That is, in the eyeball portion 21 of the present embodiment, the length in the direction of the axis X2 of the eyeball portion 21 is shorter than that of a conventional general eyeball. Moreover, the tip end surface 50 of the eyeball portion 21 includes a cut surface 50a perpendicular to the axis X2, and cut surfaces 50b and 50c cut obliquely to the axis X2. This is due to space constraints in the stabilizer mount of the suspension.

  The distal end side curved portion 55 present in the trim portion 51 is formed at a first corner portion C1 where the first flat surface 41 and the distal end surface 50 intersect outside the outer periphery Q1 (shown in FIG. 3) of the annular reference surface 52. . That is, the distal end side curved portion 55 is formed between the outer periphery Q1 of the annular reference surface 52 and the distal end surface 50. The distal end side curved portion 55 decreases in thickness from the first plane 41 to the distal end surface 50 over the first length H1 (shown in FIG. 4). The first length H1 is, for example, in the range of 2.0 to 3.5 mm although it varies depending on conditions such as the temperature of the eyeball portion 21 when cutting the trim portion 51 and the thickness T1 of the eyeball portion 21.

  As the thickness T1 of the eyeball portion 21 is larger, the length (first length H1) of the distal end side curved portion 55 tends to be larger. The eyeball portion 21 of the present embodiment has a considerably short distance between the trim portion 51 and the annular reference surface 52 as compared with the conventional general eyeball portion. That is, the distance L1 from the outer periphery Q1 of the annular reference surface 52 to the tip surface 50 is smaller than the distance L2 from the outer periphery Q1 of the annular reference surface 52 to the opening 45a (L1 <L2).

  When the present inventors intensively studied, the length of the distal end side curved portion 55 and the length of the hole side curved portion 60 were processed by processing the eyeball portion 21 using the processing device 100 shown in FIGS. 6 to 10. It has been found that it can be made much smaller than conventional eyeballs. Moreover, by using the processing apparatus 100, the annular reference surface 52 having the target flatness can be obtained.

  The hole-side curved portion 60 present at the edge of the through hole 45 is formed at a second corner C2 where the first flat surface 41 and the inner surface 46 of the through hole 45 intersect. That is, on the inner side of the inner periphery Q2 of the annular reference surface 52, the hole side curved portion 60 is formed on the entire periphery of the edge (the opening 45a of the through hole 45) where the first flat surface 41 and the inner surface 46 intersect.

  As schematically shown in FIG. 4, the hole-side curved portion 60 includes a trim-bent curved surface 60 a located closer to the trim portion 51 and an anti-trim curved surface 60 b located farther from the trim portion 51. It contains. The trim offset curved surface 60 a is formed from the first plane 41 to the inner surface 46 over a second length H 2. The second length H2 is shorter than the length of the distal end side curved portion 55 (first length H1).

  The anti-trim curved surface 60 b is formed to extend from the first flat surface 41 to the inner surface 46 over the third length H 3. The third length H3 is shorter than the second length H2. For example, while the first length H1 is 3 mm, the second length H2 is, for example, 0.6 mm, and the third length H3 is, for example, 0.4 mm. The curved surface between the trim offset curved surface 60a and the anti-trim offset curved surface 60b gradually decreases in length from the second length H2 to the third length H3.

  That is, the thickness of the trim curved surface 60 a of the hole side curved portion 60 decreases from the first flat surface 41 toward the inner surface 46 over the second length H 2 (shown in FIG. 4). The anti-trim curved surface 60b decreases in thickness from the first flat surface 41 to the inner surface 46 over the third length H3.

  As shown in FIG. 4, the hole side curved portion 60 is curved from the inner periphery Q2 of the annular reference surface 52 toward the inner surface 46 of the through hole 45 with a curvature larger than that of the distal end side curved portion 55. That is, the radius of curvature r2 of the trim offset curved surface 60a is smaller than the radius of curvature r1 of the distal end side curved portion 55. Moreover, the anti-trim curved surface 60b is curved with a curvature larger than that of the trim curved surface 60a. That is, the curvature radius r3 of the anti-trim curved surface 60b is smaller than the curvature radius r2 of the trim curved surface 60a. The radius of curvature gradually decreases from the radius of curvature r2 to the radius of curvature r3 between the trim curved surface 60a and the anti-trim curved surface 60b.

  Thus, the eyeball portion 21 of the present embodiment has the distal end side curved portion 55 of the first length H1 on the outer side of the outer periphery Q1 of the annular reference surface 52. The distal end side curved portion 55 is formed at a first corner C1 where the first flat surface 41 and the distal end surface 50 intersect. Further, the eyeball portion 21 has a hole-side curved portion 60 inside the inner periphery Q2 of the annular reference surface 52. The hole-side curved portion 60 is formed at a second corner C2 where the first flat surface 41 and the inner surface 46 intersect.

  The hole side curved portion 60 includes a trim offset curved surface 60a and an anti-trim offset curved surface 60b. The length (second length H2) of the trim offset curved surface 60a is smaller than the length (first length H1) of the distal end side curved portion 55, and the length of the anti-trim offset curved surface 60b 3 greater than H3) (H1> H2> H3). That is, the length of the hole side curved portion 60 is smaller than the length of the distal end side curved portion 55. The length of the hole-side curved portion 60 is equal to or less than the second length H2 and equal to or more than the third length H3. The curvature radius r2 of the trim offset curved surface 60a is smaller than the curvature radius r1 of the distal end side curved portion 55 and larger than the curvature radius r3 of the anti-trim offset curved surface 60b (r1> r2> r3). That is, the hole side curved portion 60 is curved with a curvature larger than that of the distal end side curved portion 55. Moreover, the distal end side curved portion 55 is formed outside the outer periphery Q 1 of the annular reference surface 52, and the hole side curved portion 60 is formed inside the inner periphery Q 2 of the annular reference surface 52.

  By making the eyeball portion 21 in such a shape, the flatness of the annular reference surface 52 can be prevented from being affected by the distal end side curved portion 55 and the hole side curved portion 60, and the flatness of the annular reference surface 52 can be reduced. It could be within the tolerance range. In particular, even if the eye 21 (the eye where L1 in FIG. 3 is smaller than L2) having a small distance from the annular reference surface 52 to the trim portion 51, the annular reference surface 52 having a predetermined area and flatness is secured We were able to. L1 is a distance from the outer periphery Q1 of the annular reference surface 52 to the tip surface 50. L2 is a distance L2 from the outer periphery Q1 of the annular reference surface 52 to the opening 45a. The other eyeball 22 also has a similar annular reference surface.

  The flatness of the annular reference surface 52 is within the tolerance. However, microscopically, the ring-shaped reference surface 52 also has some unevenness and inclination. In the vicinity of the tapered portion 47 at a part of the annular reference surface 52 in the circumferential direction, a non-trimm-displaced flat portion 52 b is formed. The eyeball 21 has a flat shape due to the load applied during processing, but when the load is released after processing, the tapered portion 47 tries to return slightly to the original shape. For this reason, in particular, the anti-trim flat portion 52b may be affected by the flatness although within the tolerance range. That is, the anti-trim flat portion 52b may be more affected by the tapered portion 47 than the trim flat portion 52a.

  As described above, the hole-side curved portion 60 includes the trim offset curved surface 60 a and the anti-trim offset curved surface 60 b. The anti-trim curved surface 60b is curved with a larger curvature (small curvature radius) than the trim curved surface 60a. In addition, the length H3 of the anti-trim curved surface 60b is smaller than the length H2 of the trim curved surface 60a. Therefore, the width S2 (shown in FIG. 4) of the anti-trim flat portion 52b is slightly larger than the width S1 of the trim flat portion 52a.

  That is, the annular reference surface 52 becomes slightly wider from the trim flat portion 52a of the width S1 toward the anti-trim flat portion 52b of the width S2. Therefore, the area on the side of the anti-trim flat portion 52b can be made slightly larger than the area on the side of the trim flat portion 52a. As a result, minute variations in shape of the anti-trim flat portion 52b can be alleviated, and the surface pressure received by the annular reference surface 52 as the fastening surface can be made even more uniform.

  FIG. 5 schematically shows an eyeball portion 21 'according to the second embodiment. Similar to the eyeball portion 21 of the first embodiment, the eyeball portion 21 ′ includes the through hole 45, the trim portion 51, the annular reference surface 52, the distal end side curved portion 55, and the hole side curved portion 60. It is equipped. The annular reference surface 52 is formed concentrically around the opening 45 a of the through hole 45. The distal end side curved portion 55 is formed on the outer side of the outer periphery Q1 of the annular reference surface 52 at a first corner portion C1 where the first flat surface 41 and the distal end surface 50 intersect. H1 in FIG. 5 indicates the length (first length) of the distal end side curved portion 55. The hole-side curved portion 60 is formed inside the inner periphery Q2 of the annular reference surface 52 at a second corner C2 where the first flat surface 41 and the inner surface 46 intersect.

  The hole-side curved portion 60 includes a trim offset curved surface 60 a near the trim portion 51 and an anti-trim offset curved surface 60 b on the side far from the trim portion 51. H2 in FIG. 5 indicates the length (second length) of the trim offset curved surface 60a. H3 indicates the length (third length) of the anti-trim curved surface 60b. The second length H2 is smaller than the first length H1. The third length H3 is smaller than the second length H2. As in the first embodiment, the hole side curved portion 60 is curved with a curvature (small curvature radius) larger than that of the distal end side curved portion 55. The anti-trim curved surface 60b is curved with a larger curvature (small curvature radius) than the trim curved surface 60a.

  L1 in FIG. 5 indicates the distance from the outer periphery Q1 of the annular reference surface 52 to the tip surface 50. L2 indicates the distance from the outer periphery Q1 of the annular reference surface 52 to the opening 45a. Like the eyeball portion 21 of the first embodiment, the eyeball portion 21 ′ has L1 smaller than L2.

  Next, the processing apparatus 100 for the eyeball will be described with reference to FIGS. 6 to 10. 6 to 10 show the movement of the processing apparatus 100 when processing the eyeball in the order of steps. Although FIGS. 6 to 10 show the case where one eyeball 21 is processed, the other eyeball 22 is also processed in the same manner, and hence the case where one eyeball 21 is processed is represented as a representative. To explain.

  The processing apparatus 100 includes a base (base) 101, a lower mold 102, an upper mold 103, a hydraulic drive stripper 104, a hydraulic unit 105, and a control unit 106. The base 101 is fixed to a floor or the like of a factory. The lower mold 102 is disposed on the base 101. The upper die 103 and the hydraulic drive stripper 104 are disposed above the lower die 102, respectively. The lower die 102 is provided with a work support portion 110 for mounting the eyeball portion 21 and a lower blade 111.

  An upper blade 120 and a punch 121 are provided on the upper die 103. The upper blade 120 is paired with the lower blade 111. The eye 21 is pressurized between the workpiece support 110 and the hydraulic drive stripper 104. The trim portion 51 of the eyeball portion 21 is cut by lowering the upper blade 120 toward the lower mold 102 from the first position (shown in FIG. 6) to the second position (shown in FIG. 8).

  The punch 121 can move up and down together with the upper blade 120 across the first position and the second position. When the upper die 103 is lowered toward the lower die 102 to the second position, the trim portion 51 is cut by the lower blade 111 and the upper blade 120, and at the same time a through hole 45 is formed in the eyeball portion 21 by the punch 121. Ru. Therefore, the positional relationship between the through hole 45 and the trim portion 51 does not vary, and the through hole 45 and the trim portion 51 can be formed with high accuracy.

  The hydraulic drive stripper 104 functions as a pressing member for pressing the eyeball portion 21. The hydraulic drive stripper 104 is formed with holes 125 in the vertical direction into which the punches 121 are inserted. The hydraulic drive stripper 104 is vertically moved by an actuator 131. With the upper die 103 lowered to the second position, the hydraulic drive stripper 104 pressurizes the eyeball portion 21 with a hydraulic pressure P (shown in FIGS. 7 and 9) of a predetermined pressure. As a result, the eyeball portion 21 is pressurized in the thickness direction between the hydraulic drive stripper 104 and the work support portion 110. One example of the hydraulic pressure supplied to the actuator 131 is 20 MPa (5 to 35 MPa), but other pressures may be used.

  The hydraulic unit 105 includes a first actuator 130 such as a hydraulic cylinder, a second actuator 131 such as a hydraulic cylinder, a hydraulic pressure supply source 132 and the like. The first actuator 130 moves the upper die 103 in the vertical direction. The second actuator 131 moves the hydraulic drive stripper 104 in the vertical direction. The fluid pressure supply source 132 includes a hydraulic pump, a distribution valve, and the like that supply fluid pressure to the actuators 130 and 131. The hydraulic pressure supply source 132 is controlled in a predetermined sequence by a control unit 106 in which an electrical control program and control data are stored.

  The control unit 106 controls the actuator 130 so that the upper mold 103 moves between the first position and the second position. For example, by moving the upper mold 103 from the first position toward the second position, the trim portion 51 is cut by the lower blade 111 and the upper blade 120, and the through hole 45 is punched by the punch 121. .

  The control unit 106 controls the actuator 131 to press the hydraulic drive stripper 104 against the eyeball portion 21 with a constant hydraulic pressure P while the upper die 103 moves from the first position to the second position. . Moreover, the control unit 106 controls the actuator 131 to maintain the hydraulic pressure P of the hydraulic drive stripper 104 while the upper die 103 is raised and returned from the second position to the first position. Therefore, while the upper mold 103 is moved from the second position to the first position, the pressurization of the eyeball portion 21 by the hydraulic pressure P is continued. The control unit 106 releases the hydraulic pressure that has been pressurizing the eye 21 until then in the state where the upper mold 103 is returned to the first position, and retracts the hydraulic drive stripper 104 above the eye 21. It also has a function.

  The processing method of the eyeball part which concerns on this embodiment processes the eyeball part 21 through the following process. Since the other eyeball portion 22 is also processed in the same manner, the case of processing one eyeball portion 21 will be described below.

(1) As shown in FIG. 6, the eyeball portion 21 of the heated stabilizer 10 is placed on the workpiece support portion 110 of the lower mold 102. The temperature of the heated stabilizer 10 is, for example, 850 to 1150 ° C.
(2) As shown in FIG. 7, the hydraulic drive stripper 104 is moved (lowered) in the direction indicated by the arrow A1 from above the eyeball portion 21. Then, the fluid pressure drive stripper 104 is pressurized toward the eyeballs 21 by the fluid pressure P, thereby sandwiching the eyeball 21 in the thickness direction between the fluid pressure drive stripper 104 and the work support 110.
(3) As shown in FIG. 8, in a state where the eyeball portion 21 is pressurized by the hydraulic drive stripper 104, the upper die 103 is moved (lowered) in the direction indicated by the arrow A2 toward the lower die 102. By this operation, the upper blade 120 and the punch 121 are simultaneously lowered, and the trim portion 51 is cut between the lower blade 111 and the upper blade 120, and the punch 121 forms the through hole 45. When the trim portion 51 is cut by the upper blade 120, the distal end side curved portion 55 is formed on the cut surface (near the upper edge of the trim portion 51) of the trim portion 51 in contact with the upper blade 120. When the through hole 45 is punched out by the punch 121, the hole side curved portion 60 is formed at the edge (around the opening 45a) of the inner surface of the through hole 45 in contact with the punch 121.
(4) As shown in FIG. 9, after the through hole 45 and the trim portion 51 are formed, the upper die 103 moves (rises) in the direction indicated by the arrow A3. While the upper die 103 is raised to the first position, the eyeball portion 21 is kept pressurized under the fluid pressure P by maintaining the fluid pressure P supplied to the fluid pressure drive stripper 104.
(5) As shown in FIG. 10, when the upper die 103 ascends to the first position, the eyeball portion 21 is pressurized until then, and the hydraulic pressure of the hydraulic drive stripper 104 is released. The hydraulic drive stripper 104 retracts from the eyeball portion 21 by moving (raising) the hydraulic drive stripper 104 in the direction indicated by the arrow A4.

  As a result of intensive studies by the present inventors, it has been found that the processing method of the present embodiment is effective in enhancing the accuracy of the annular reference surface 52. That is, while the upper die 103 is raised from the second position to the first position after the through hole 45 and the trim portion 51 are formed, the hydraulic pressure P supplied to the hydraulic drive stripper 104 is maintained for a predetermined time, Continue to press the part 21 under the hydraulic pressure P. By doing this, the length H1 (shown in FIGS. 4 and 5) of the distal end side curved portion 55 and the lengths H2 and H3 of the hole side curved portion 60 can be reduced, and the curvature radius of the distal end side curved portion 55 The radius of curvature r2, r3 of the hole side curved portion 60 could also be reduced.

  For comparison, tests were also performed on the case of processing the eyeball using a conventional processing apparatus (comparative example). The processing apparatus of the comparative example has a movable stripper that holds the eye ball by the repulsive load of the coil spring. In this comparative example, as the movable stripper rises, the repulsive load of the coil spring decreases, and the repulsive load of the coil spring becomes zero in a short time. The tip side curved portion and the hole side curved portion of the eyeball portion processed by the conventional processing apparatus are longer than the tip side curved portion and the hole side curved portion of the eyeball portion of the present embodiment, and the radius of curvature is also large.

  When the trim portion 51 is sheared by the lower blade 111 and the upper blade 120, burrs may occur on the second flat surface 42 side of the distal end surface 50. In addition, when the through hole 45 is punched out by the punch 121, a burr may be generated on the second plane 42 side of the inner surface 46. These burrs are removed by finish machining such as grinding or grinding in the second plane.

  In practicing the present invention, the steel material that is the material of the stabilizer may be a solid material other than the hollow material (steel pipe). Further, it goes without saying that the specific shape, arrangement and the like of the stabilizer main body portion and the eyeball portion can be variously changed and implemented according to the specification of the suspension mechanism portion of the vehicle. The specific shapes of the annular reference surface (fastening surface) of the eyeball portion, the distal end side curved portion and the hole side curved portion are not limited to the above embodiment.

  DESCRIPTION OF SYMBOLS 10 ... Stabilizer, 20 ... Stabilizer main part, 21, 22 ... Eyeball part, 25 ... Torsion part, 26, 27 ... Bent part, 28, 29 ... Arm part, 41 ... 1st plane, 42 ... 2nd plane, 45 ... Through hole 45a: opening 46: inner surface 47: tapered portion 50: tip end surface 51: trim portion 52: annular reference surface (fastening surface) 52a: trim offset flat portion 52b: anti-trim offset flat Portion, Q1: outer periphery of annular reference surface, 55: tip side curved portion, 60: hole side curved portion, 60a: trim-turned curved surface, 60b: anti-trim-turned curved surface, C1: first corner, C2: first 2 corners, H1: first length, H2: second length, H3: third length, 100: processing device, 101: base, 102: lower mold, 103: upper mold, 104 ... hydraulic drive stripper, 105 ... hydraulic unit, 106 ... control unit, 10 ... workpiece support, 111 ... lower blade, 120 ... upper blade, 121 ... punch.

Claims (5)

A stabilizer for a vehicle having eyes 21 and 22 at both ends thereof,
The eyeballs (21) and (22) are respectively
A first plane (41) and a second plane (42) parallel to each other;
A trim portion (51) located at the tip of each of the eyeballs (21) and (22) and having a tip surface (50) perpendicular to the first flat surface (41) and the second flat surface (42);
And a through hole (45) having an inner surface (46) perpendicular to the first flat surface (41) and the second flat surface (42) and opening in the first flat surface (41) and the second flat surface (42) ,
A flat annular reference surface (52) formed around the opening (45a) of the through hole (45) in part of the first plane (41);
It is formed in the 1st corner (C1) which said 1st plane (41) and said tip side (50) cross on the outer side of said annular reference plane (52), and said tip from said 1st plane (41) A distal curve (55) of decreasing thickness towards the surface (50) over a first length (H1);
At the second corner (C2) where the first plane (41) and the inner surface (46) of the through hole (45) intersect inside the annular reference surface (52), the entire circumference of the opening (45a) And the thickness decreases from the first flat surface (41) to the inner surface (46) over a length shorter than the first length (H1) and from the distal curved portion (55) Hole-side curved portion (60) that curves with a large curvature,
Equipped with,
The hole-side curved portion (60) is a trim-bent curved surface (60a) of a second length (H2) formed at a position near the trim portion (51), and a side far from the trim portion (51) Characterized in that the third length (H3) of the anti-trim curved surface (60b) formed in the third length (H3) is smaller than the second length (H2) Stabilizer for vehicles. In the vehicle stabilizer of claim 1,
The distance (L1) from the outer periphery (Q1) of the annular reference surface (52) to the tip surface (50) is the distance (L2) from the outer periphery (Q1) of the annular reference surface (52) to the opening (45a) Stabilizer for vehicles characterized by being smaller than). The stabilizer for vehicles according to claim 1 , wherein the curvature of said anti-trim curved surface (60b) is larger than the curvature of said trim curved surface (60a). A processing apparatus for processing the eyeball portion of the stabilizer for a vehicle according to claim 1;
A lower die (102) provided with a workpiece support (110) for placing the eyeball portion of the stabilizer and a lower blade (111);
An upper mold (103) disposed above the lower mold (102) and vertically moving relative to the lower mold (102) over a first position and a second position;
A hydraulic drive stripper (104) disposed above the lower die (102) and vertically moving relative to the lower die (102);
A hydraulic pressure unit (105) for supplying a hydraulic pressure that pressurizes the eye ball in a thickness direction to the hydraulic drive stripper (104) in a state where the hydraulic drive stripper (104) is lowered;
It is provided in the upper mold (103), and the second portion from the first position in a state where the eyeball portion is pressurized between the work support portion (110) and the hydraulic drive stripper (104). An upper blade (120) for cutting the trim portion (51) at the tip of the eyeball portion by lowering to a position;
A punch (121) provided in the upper die (103) and forming a through hole (45) in the eyeball portion by simultaneously lowering the upper blade (120) toward the lower die (102);
While the upper die (103) rises from the second position toward the first position, the hydraulic pressure is maintained to pressurize the eyeball portion by the hydraulic drive stripper (104). Continuing, releasing the hydraulic pressure in a state where the upper die (103) has risen to the first position, and retracting the hydraulic drive stripper (104) from the eyeball portion to release the third length (H3) Control unit (106) that makes) smaller than the second length (H2) ;
An apparatus for processing an eyeball portion of a stabilizer for a vehicle, comprising: It is a processing method for processing the said eyeball part of the stabilizer for vehicles described in Claim 1, Comprising:
Place the eyes of the heated stabilizer on the lower mold (102),
A hydraulic drive stripper (104) is lowered from above the eyeball portion, and the hydraulic drive stripper (104) is pressurized toward the eyeball portion by the hydraulic pressure to thereby move the eyeball portion to the hydraulic drive stripper (104). ) And the lower die (102) in the thickness direction,
With the eyeball portion pressurized by the hydraulic drive stripper (104), the upper blade (120) provided on the upper die (103) is directed from the first position toward the lower die (102). The tip of the eyeball is cut to form a trim portion (51) by lowering to the position 2, and a through hole (45) is formed by lowering a punch (121).
After the trim portion (51) and the through hole (45) are formed, the upper blade (120) and the punch (121) are raised to the first position;
While the upper die (103) rises from the second position toward the first position, the hydraulic pressure is maintained to pressurize the eyeball portion by the hydraulic drive stripper (104). Continue,
The hydraulic pressure is released when the upper die (103) is raised to the first position, and the hydraulic drive stripper (104) is retracted from the eyeball to move the third length (H3) to the third position. Be smaller than the second length (H2) ,
The processing method of the eyeball part of the stabilizer for vehicles characterized by the above.

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